a69cc9f13d
Since Embree v3.13.0 supports AARCH64, switch back to the
official repo instead of using Embree-aarch64.
`thirdparty/embree/patches/godot-changes.patch` should now contain
an accurate diff of the changes done to the library.
(cherry picked from commit 767e374dce)
408 lines
15 KiB
C++
408 lines
15 KiB
C++
// Copyright 2009-2021 Intel Corporation
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
#pragma once
|
|
|
|
#include "triangle.h"
|
|
#include "trianglev.h"
|
|
#include "trianglev_mb.h"
|
|
#include "intersector_epilog.h"
|
|
|
|
/*! Modified Pluecker ray/triangle intersector. The test first shifts
|
|
* the ray origin into the origin of the coordinate system and then
|
|
* uses Pluecker coordinates for the intersection. Due to the shift,
|
|
* the Pluecker coordinate calculation simplifies and the tests get
|
|
* numerically stable. The edge equations are watertight along the
|
|
* edge for neighboring triangles. */
|
|
|
|
namespace embree
|
|
{
|
|
namespace isa
|
|
{
|
|
template<int M, typename UVMapper>
|
|
struct PlueckerHitM
|
|
{
|
|
__forceinline PlueckerHitM(const UVMapper& mapUV) : mapUV(mapUV) {}
|
|
|
|
__forceinline PlueckerHitM(const vbool<M>& valid, const vfloat<M>& U, const vfloat<M>& V, const vfloat<M>& UVW, const vfloat<M>& t, const Vec3vf<M>& Ng, const UVMapper& mapUV)
|
|
: U(U), V(V), UVW(UVW), mapUV(mapUV), valid(valid), vt(t), vNg(Ng) {}
|
|
|
|
__forceinline void finalize()
|
|
{
|
|
const vbool<M> invalid = abs(UVW) < min_rcp_input;
|
|
const vfloat<M> rcpUVW = select(invalid,vfloat<M>(0.0f),rcp(UVW));
|
|
vu = min(U * rcpUVW,1.0f);
|
|
vv = min(V * rcpUVW,1.0f);
|
|
mapUV(vu,vv,vNg);
|
|
}
|
|
|
|
__forceinline Vec2vf<M> uv() const { return Vec2vf<M>(vu,vv); }
|
|
__forceinline vfloat<M> t () const { return vt; }
|
|
__forceinline Vec3vf<M> Ng() const { return vNg; }
|
|
|
|
__forceinline Vec2f uv (const size_t i) const { return Vec2f(vu[i],vv[i]); }
|
|
__forceinline float t (const size_t i) const { return vt[i]; }
|
|
__forceinline Vec3fa Ng(const size_t i) const { return Vec3fa(vNg.x[i],vNg.y[i],vNg.z[i]); }
|
|
|
|
public:
|
|
vfloat<M> U;
|
|
vfloat<M> V;
|
|
vfloat<M> UVW;
|
|
const UVMapper& mapUV;
|
|
|
|
public:
|
|
vbool<M> valid;
|
|
vfloat<M> vu;
|
|
vfloat<M> vv;
|
|
vfloat<M> vt;
|
|
Vec3vf<M> vNg;
|
|
};
|
|
|
|
template<int M, bool early_out = true>
|
|
struct PlueckerIntersector1
|
|
{
|
|
__forceinline PlueckerIntersector1() {}
|
|
|
|
__forceinline PlueckerIntersector1(const Ray& ray, const void* ptr) {}
|
|
|
|
template<typename UVMapper>
|
|
__forceinline bool intersect(const vbool<M>& valid0,
|
|
Ray& ray,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
PlueckerHitM<M,UVMapper>& hit) const
|
|
{
|
|
vbool<M> valid = valid0;
|
|
|
|
/* calculate vertices relative to ray origin */
|
|
const Vec3vf<M> O = Vec3vf<M>((Vec3fa)ray.org);
|
|
const Vec3vf<M> D = Vec3vf<M>((Vec3fa)ray.dir);
|
|
const Vec3vf<M> v0 = tri_v0-O;
|
|
const Vec3vf<M> v1 = tri_v1-O;
|
|
const Vec3vf<M> v2 = tri_v2-O;
|
|
|
|
/* calculate triangle edges */
|
|
const Vec3vf<M> e0 = v2-v0;
|
|
const Vec3vf<M> e1 = v0-v1;
|
|
const Vec3vf<M> e2 = v1-v2;
|
|
|
|
/* perform edge tests */
|
|
const vfloat<M> U = dot(cross(e0,v2+v0),D);
|
|
const vfloat<M> V = dot(cross(e1,v0+v1),D);
|
|
const vfloat<M> W = dot(cross(e2,v1+v2),D);
|
|
const vfloat<M> UVW = U+V+W;
|
|
const vfloat<M> eps = float(ulp)*abs(UVW);
|
|
#if defined(EMBREE_BACKFACE_CULLING)
|
|
valid &= max(U,V,W) <= eps;
|
|
#else
|
|
valid &= (min(U,V,W) >= -eps) | (max(U,V,W) <= eps);
|
|
#endif
|
|
if (unlikely(early_out && none(valid))) return false;
|
|
|
|
/* calculate geometry normal and denominator */
|
|
const Vec3vf<M> Ng = stable_triangle_normal(e0,e1,e2);
|
|
const vfloat<M> den = twice(dot(Ng,D));
|
|
|
|
/* perform depth test */
|
|
const vfloat<M> T = twice(dot(v0,Ng));
|
|
const vfloat<M> t = rcp(den)*T;
|
|
valid &= vfloat<M>(ray.tnear()) <= t & t <= vfloat<M>(ray.tfar);
|
|
valid &= den != vfloat<M>(zero);
|
|
if (unlikely(early_out && none(valid))) return false;
|
|
|
|
/* update hit information */
|
|
new (&hit) PlueckerHitM<M,UVMapper>(valid,U,V,UVW,t,Ng,mapUV);
|
|
return true;
|
|
}
|
|
|
|
template<typename UVMapper>
|
|
__forceinline bool intersectEdge(const vbool<M>& valid,
|
|
Ray& ray,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
PlueckerHitM<M,UVMapper>& hit) const
|
|
{
|
|
return intersect(valid,ray,tri_v0,tri_v1,tri_v2,mapUV,hit);
|
|
}
|
|
|
|
template<typename UVMapper>
|
|
__forceinline bool intersectEdge(Ray& ray,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
PlueckerHitM<M,UVMapper>& hit) const
|
|
{
|
|
vbool<M> valid = true;
|
|
return intersect(valid,ray,tri_v0,tri_v1,tri_v2,mapUV,hit);
|
|
}
|
|
|
|
template<typename UVMapper>
|
|
__forceinline bool intersect(Ray& ray,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
PlueckerHitM<M,UVMapper>& hit) const
|
|
{
|
|
return intersectEdge(ray,tri_v0,tri_v1,tri_v2,mapUV,hit);
|
|
}
|
|
|
|
template<typename UVMapper, typename Epilog>
|
|
__forceinline bool intersectEdge(Ray& ray,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& e1,
|
|
const Vec3vf<M>& e2,
|
|
const UVMapper& mapUV,
|
|
const Epilog& epilog) const
|
|
{
|
|
PlueckerHitM<M,UVMapper> hit(mapUV);
|
|
if (likely(intersectEdge(ray,v0,e1,e2,mapUV,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename UVMapper, typename Epilog>
|
|
__forceinline bool intersect(Ray& ray,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const UVMapper& mapUV,
|
|
const Epilog& epilog) const
|
|
{
|
|
PlueckerHitM<M,UVMapper> hit(mapUV);
|
|
if (likely(intersect(ray,v0,v1,v2,mapUV,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline bool intersect(Ray& ray,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const Epilog& epilog) const
|
|
{
|
|
auto mapUV = UVIdentity<M>();
|
|
PlueckerHitM<M,UVIdentity<M>> hit(mapUV);
|
|
if (likely(intersect(ray,v0,v1,v2,mapUV,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename UVMapper, typename Epilog>
|
|
__forceinline bool intersect(const vbool<M>& valid,
|
|
Ray& ray,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const UVMapper& mapUV,
|
|
const Epilog& epilog) const
|
|
{
|
|
PlueckerHitM<M,UVMapper> hit(mapUV);
|
|
if (likely(intersect(valid,ray,v0,v1,v2,mapUV,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
};
|
|
|
|
template<int K, typename UVMapper>
|
|
struct PlueckerHitK
|
|
{
|
|
__forceinline PlueckerHitK(const UVMapper& mapUV) : mapUV(mapUV) {}
|
|
|
|
__forceinline PlueckerHitK(const vfloat<K>& U, const vfloat<K>& V, const vfloat<K>& UVW, const vfloat<K>& t, const Vec3vf<K>& Ng, const UVMapper& mapUV)
|
|
: U(U), V(V), UVW(UVW), t(t), Ng(Ng), mapUV(mapUV) {}
|
|
|
|
__forceinline std::tuple<vfloat<K>,vfloat<K>,vfloat<K>,Vec3vf<K>> operator() () const
|
|
{
|
|
const vbool<K> invalid = abs(UVW) < min_rcp_input;
|
|
const vfloat<K> rcpUVW = select(invalid,vfloat<K>(0.0f),rcp(UVW));
|
|
vfloat<K> u = min(U * rcpUVW,1.0f);
|
|
vfloat<K> v = min(V * rcpUVW,1.0f);
|
|
Vec3vf<K> vNg = Ng;
|
|
mapUV(u,v,vNg);
|
|
return std::make_tuple(u,v,t,vNg);
|
|
}
|
|
vfloat<K> U;
|
|
vfloat<K> V;
|
|
const vfloat<K> UVW;
|
|
const vfloat<K> t;
|
|
const Vec3vf<K> Ng;
|
|
const UVMapper& mapUV;
|
|
};
|
|
|
|
template<int M, int K>
|
|
struct PlueckerIntersectorK
|
|
{
|
|
__forceinline PlueckerIntersectorK() {}
|
|
__forceinline PlueckerIntersectorK(const vbool<K>& valid, const RayK<K>& ray) {}
|
|
|
|
/*! Intersects K rays with one of M triangles. */
|
|
template<typename UVMapper>
|
|
__forceinline vbool<K> intersectK(const vbool<K>& valid0,
|
|
RayK<K>& ray,
|
|
const Vec3vf<K>& tri_v0,
|
|
const Vec3vf<K>& tri_v1,
|
|
const Vec3vf<K>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
PlueckerHitK<K,UVMapper> &hit) const
|
|
{
|
|
/* calculate vertices relative to ray origin */
|
|
vbool<K> valid = valid0;
|
|
const Vec3vf<K> O = ray.org;
|
|
const Vec3vf<K> D = ray.dir;
|
|
const Vec3vf<K> v0 = tri_v0-O;
|
|
const Vec3vf<K> v1 = tri_v1-O;
|
|
const Vec3vf<K> v2 = tri_v2-O;
|
|
|
|
/* calculate triangle edges */
|
|
const Vec3vf<K> e0 = v2-v0;
|
|
const Vec3vf<K> e1 = v0-v1;
|
|
const Vec3vf<K> e2 = v1-v2;
|
|
|
|
/* perform edge tests */
|
|
const vfloat<K> U = dot(Vec3vf<K>(cross(e0,v2+v0)),D);
|
|
const vfloat<K> V = dot(Vec3vf<K>(cross(e1,v0+v1)),D);
|
|
const vfloat<K> W = dot(Vec3vf<K>(cross(e2,v1+v2)),D);
|
|
const vfloat<K> UVW = U+V+W;
|
|
const vfloat<K> eps = float(ulp)*abs(UVW);
|
|
#if defined(EMBREE_BACKFACE_CULLING)
|
|
valid &= max(U,V,W) <= eps;
|
|
#else
|
|
valid &= (min(U,V,W) >= -eps) | (max(U,V,W) <= eps);
|
|
#endif
|
|
if (unlikely(none(valid))) return valid;
|
|
|
|
/* calculate geometry normal and denominator */
|
|
const Vec3vf<K> Ng = stable_triangle_normal(e0,e1,e2);
|
|
const vfloat<K> den = twice(dot(Vec3vf<K>(Ng),D));
|
|
|
|
/* perform depth test */
|
|
const vfloat<K> T = twice(dot(v0,Vec3vf<K>(Ng)));
|
|
const vfloat<K> t = rcp(den)*T;
|
|
valid &= ray.tnear() <= t & t <= ray.tfar;
|
|
valid &= den != vfloat<K>(zero);
|
|
if (unlikely(none(valid))) return valid;
|
|
|
|
/* calculate hit information */
|
|
new (&hit) PlueckerHitK<K,UVMapper>(U,V,UVW,t,Ng,mapUV);
|
|
return valid;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline vbool<K> intersectK(const vbool<K>& valid0,
|
|
RayK<K>& ray,
|
|
const Vec3vf<K>& tri_v0,
|
|
const Vec3vf<K>& tri_v1,
|
|
const Vec3vf<K>& tri_v2,
|
|
const Epilog& epilog) const
|
|
{
|
|
UVIdentity<K> mapUV;
|
|
PlueckerHitK<K,UVIdentity<K>> hit(mapUV);
|
|
const vbool<K> valid = intersectK(valid0,ray,tri_v0,tri_v1,tri_v2,mapUV,hit);
|
|
return epilog(valid,hit);
|
|
}
|
|
|
|
template<typename UVMapper, typename Epilog>
|
|
__forceinline vbool<K> intersectK(const vbool<K>& valid0,
|
|
RayK<K>& ray,
|
|
const Vec3vf<K>& tri_v0,
|
|
const Vec3vf<K>& tri_v1,
|
|
const Vec3vf<K>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
const Epilog& epilog) const
|
|
{
|
|
PlueckerHitK<K,UVMapper> hit(mapUV);
|
|
const vbool<K> valid = intersectK(valid0,ray,tri_v0,tri_v1,tri_v2,mapUV,hit);
|
|
return epilog(valid,hit);
|
|
}
|
|
|
|
/*! Intersect k'th ray from ray packet of size K with M triangles. */
|
|
template<typename UVMapper>
|
|
__forceinline bool intersect(RayK<K>& ray, size_t k,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
PlueckerHitM<M,UVMapper> &hit) const
|
|
{
|
|
/* calculate vertices relative to ray origin */
|
|
const Vec3vf<M> O = broadcast<vfloat<M>>(ray.org,k);
|
|
const Vec3vf<M> D = broadcast<vfloat<M>>(ray.dir,k);
|
|
const Vec3vf<M> v0 = tri_v0-O;
|
|
const Vec3vf<M> v1 = tri_v1-O;
|
|
const Vec3vf<M> v2 = tri_v2-O;
|
|
|
|
/* calculate triangle edges */
|
|
const Vec3vf<M> e0 = v2-v0;
|
|
const Vec3vf<M> e1 = v0-v1;
|
|
const Vec3vf<M> e2 = v1-v2;
|
|
|
|
|
|
/* perform edge tests */
|
|
const vfloat<M> U = dot(cross(e0,v2+v0),D);
|
|
const vfloat<M> V = dot(cross(e1,v0+v1),D);
|
|
const vfloat<M> W = dot(cross(e2,v1+v2),D);
|
|
|
|
const vfloat<M> UVW = U+V+W;
|
|
const vfloat<M> eps = float(ulp)*abs(UVW);
|
|
#if defined(EMBREE_BACKFACE_CULLING)
|
|
vbool<M> valid = max(U,V,W) <= eps;
|
|
#else
|
|
vbool<M> valid = (min(U,V,W) >= -eps) | (max(U,V,W) <= eps);
|
|
#endif
|
|
if (unlikely(none(valid))) return false;
|
|
|
|
/* calculate geometry normal and denominator */
|
|
const Vec3vf<M> Ng = stable_triangle_normal(e0,e1,e2);
|
|
const vfloat<M> den = twice(dot(Ng,D));
|
|
|
|
/* perform depth test */
|
|
const vfloat<M> T = twice(dot(v0,Ng));
|
|
const vfloat<M> t = rcp(den)*T;
|
|
valid &= vfloat<M>(ray.tnear()[k]) <= t & t <= vfloat<M>(ray.tfar[k]);
|
|
if (unlikely(none(valid))) return false;
|
|
|
|
/* avoid division by 0 */
|
|
valid &= den != vfloat<M>(zero);
|
|
if (unlikely(none(valid))) return false;
|
|
|
|
/* update hit information */
|
|
new (&hit) PlueckerHitM<M,UVMapper>(valid,U,V,UVW,t,Ng,mapUV);
|
|
return true;
|
|
}
|
|
|
|
template<typename UVMapper, typename Epilog>
|
|
__forceinline bool intersect(RayK<K>& ray, size_t k,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const UVMapper& mapUV,
|
|
const Epilog& epilog) const
|
|
{
|
|
PlueckerHitM<M,UVMapper> hit(mapUV);
|
|
if (intersect(ray,k,tri_v0,tri_v1,tri_v2,mapUV,hit))
|
|
return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline bool intersect(RayK<K>& ray, size_t k,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
const Epilog& epilog) const
|
|
{
|
|
UVIdentity<M> mapUV;
|
|
PlueckerHitM<M,UVIdentity<M>> hit(mapUV);
|
|
if (intersect(ray,k,tri_v0,tri_v1,tri_v2,mapUV,hit))
|
|
return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
};
|
|
}
|
|
}
|